How much $$$ are you planning to spend? And how bulky is too bulky?
If you're spending $500-$1K and don't mind the bulk, a DSLR makes sense, and of those, Canon and Nikon are the two top brands. However, that's going to be a
lot bulkier than what you have now. If photography is the primary objective of these trips, that might not be a problem... but it's not something everyone wants to be carrying around a lot.
If a DSLR it too bulky or expensive for your tastes, I recommend something such as
this Sony HX9V camera as a nice in-between from the basic 3-5x zoom point-and-shoot like your current one and a big DSLR. It'll be a fair bit larger, but still pocketable unless you have small pockets. And with four times the zoom and considerably improved image quality, it's a nice step up. It's also pretty good with night photos (including outside and from a distance), if you take those.
(Note that Amazon's current price for it is overpriced by $50-$70. Its
successor is more fairly priced, but I'm not familiar enough with it to know if it's truly preferable)
And if you want to always be prepared, you can do better on the cell phone camera front, too. If I were willing to spend the money on a cell phone, the one I'd get for a fantastic camera is the Nokia's flagship
808 PureView. Some people might prefer iOS to Symbian, but my, the camera! It's no comparison. Best camera on a cell phone that you can buy today, and likely will be the best until Nokia eventually releases a successor to it.